检索结果-南通市图书馆

Growth and Characterization of Cu2O Films Made by Rapid Thermal Oxidation Technique

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2005年第11期22卷 2977-2979页

作者： Raid A. ismail Ibrahim Ramadhan Aseel Mustafa Department of Applied Physics Ministry of Sciences and Technology Baghdad Iraq Department of Physics College of Science University of Al-Mustansiriyah Iraq

Cu2O thin films with （111） preferred orientation have been grown on glass and Cu substrates by rapid thermal oxidation of Cu at 500℃ for 45s. The optical band gap energy was determined by spectral data of transmittance and absorbance to be 2.04eV. The electrical conductivity of grown films was measured around （1：1 × 10^-5Ω^-1cm^-1） at 300K. Thermoelectric power measurements of the film were carried out. Furthermore, the properties of these films are compared with properties of Cu2O obtained by other methods.

关键词： SINGLE-CRYSTAL THIN-FILMS CUPROUS OXIDE

Monitoring and analysing the Emirate of Dubai’s land use/land cover changes:an integrated,low-cost remote sensing approach

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2018年第11期11卷 1132-1150页

作者： Samy ismail Elmahdy Mohamed Mostafa Mohameda Civil and Environmental Engineering Department College of Engineering United Arab Emirates UniversityAl-AinUnited Arab Emirates Irrigation and Hydraulics Department Faculty of EngineeringCairo UniversityGizaEgypt

This study presents a modified low-cost approach,which integrates the spectral angle mapper and image difference algorithms in order to enhance classification maps for the purpose of monitoring and analysing land use/land cover change between 2000 and 2015 for the Emirate of *** approach was modified by collecting 320 training samples from QuickBird images with a spatial resolution of 0.6 m,as well as carrying out field observations,followed by the application of a 3×3 Soble filter,sieving classes,majority/minority analysis,and clump classes of the obtained classification *** accuracy assessment showed that the targeted 2000,2005,2010 and 2015 classification maps have 88.1252%,89.0699%,90.1225%and 96.0965%accuracy,*** results showed that the built-up area increased by 233.721 km^(2)(5.81%)between 2000 and 2005 and continues to increase even up and till the present *** assessment of changes in the periods 2000–2005 and 2010–2015 confirmed that net vegetation area losses were more pronounced from 2000 to 2005 than from 2010 to 2015,dropping from 47,618 to 40,820 km^(2),*** study is aimed to assist urban planners and decision-makers,as well as research institutes.

关键词： Dubai change detection image difference SAM algorithm

Gastric carcinogenesis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2012年第37期18卷 5164-5170页

作者： ismail Gomceli Baris Demiriz Mesut Tez Department of Gastroenterologic Surgery Antalya Education and Research Hospital Department of General Surgery Ankara Numune Education and Research Hospital

Gastric cancer is the second most common cancer worldwide and the second most common cause of cancer-related deaths. Despite complete resection of gastric cancer and lymph node dissection, as well as improvements in chemotherapy and radiotherapy, there are still 700 000 gastric cancer-related deaths per year worldwide and more than 80% of patients with advanced gastric cancer die of the disease or recurrent disease within 1 year after diagnosis. None of the treatment modalities we have been applying today can influence the overall survival rates:at present, the overall 5-year relative survival rate for gastric cancer is about 28%. Cellular metaplasia due to chronic inflammation, injury and repair are the most documented processes for neoplasia. It appears that chronic inflammation stimulates tumor development and plays a critical role in initiating, sustaining and advancing tumor growth. It is also evident that not all inflammation is tumorigenic. Additional mutations can be acquired, and this leads to the cancer cell gaining a further growth advantage and acquiring a more malignant phenotype. Intestinalization of gastric units, which is called "intestinal metaplasia"; phenotypic antralization of fundic units, which is called "spasmolytic polypeptide-expressing metaplasia"; and the development directly from the stem/progenitor cellzone are three pathways that have been described for gastric carcinogenesis. Also, an important factor for the development of gastrointestinal cancers is peritumoral stroma. However, the initiating cellular event in gastric metaplasia is still controversial. Understanding gastric carcinogenesis and its precursor lesions has been under intense investigation, and our paper attempts to highlight recent progress in this field of cancer research.

关键词： Gastric Cancer Cancer Stem Cell Carcino-genesis Oncogenesis Tumorigenesis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

C3-Modules

Algebra Colloquium 2015年第4期22卷 655-670页

作者： ismail Amin Yasser Ibrahim Mohamed Yousif Department of Mathematics Faculty of Science Cairo University Giza Egypt Department of Mathematics The Ohio State University Lima Ohio 45804 USA

One of the continuity conditions identified by Utumi on self-injective rings is the C3-condition, where a module M is called a C3-module if whenever A and B are direct summands of M and A A B = 0, then A B is a summand of M. In addition to injective and direct-injective modules, the class of C3-modules includes the semisimple, continuous, indecomposable and regular modules. Indeed, every commutative ring is a C3-ring. In this paper we provide a general and unified treatment of the above mentioned classes of modules in terms of the C3-condition, and establish new characterizations of several well known classes of rings.

关键词： injective and quasi-injective modules C2-modules and C3-modules

Synthesis of linear low-density polyethylene-g-poly(acrylic acid)-co-starch/organo-montmorillonite hydrogel composite as an adsorbent for removal of Pb(Ⅱ) from aqueous solutions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2015年第1期27卷 9-20页

作者： Maryam Irani Hanafi ismail Zulkifli Ahmad Maohong Fan School of Materials and Mineral Resources Engineering USM Engineering Campus Universiti Sains Malaysia Department of Chemical and Petroleum Engineering University of Wyoming

The purpose of this work is to remove Pb（II） from the aqueous solution using a type of hydrogel composite. A hydrogel composite consisting of waste linear low density polyethylene, acrylic acid, starch, and organo-montmorillonite was prepared through emulsion polymerization method. Fourier transform infrared spectroscopy（FTIR）, Solid carbon nuclear magnetic resonance spectroscopy（CNMR））, silicon-29 nuclear magnetic resonance spectroscopy（Si NMR））, and X-ray diffraction spectroscope（（XRD） were applied to characterize the hydrogel composite. The hydrogel composite was then employed as an adsorbent for the removal of Pb（II） from the aqueous solution. The Pb（II）-loaded hydrogel composite was characterized using Fourier transform infrared spectroscopy（FTIR））,scanning electron microscopy（SEM））, and X-ray photoelectron spectroscopy（（XPS））. From XPS results, it was found that the carboxyl and hydroxyl groups of the hydrogel composite participated in the removal of Pb（II）. Kinetic studies indicated that the adsorption of Pb（II）followed the pseudo-second-order equation. It was also found that the Langmuir model described the adsorption isotherm better than the Freundlich isotherm. The maximum removal capacity of the hydrogel composite for Pb（II） ions was 430 mg/g. Thus, the waste linear low-density polyethylene-g-poly（acrylic acid）-co-starch/organo-montmorillonite hydrogel composite could be a promising Pb（II） adsorbent.

关键词： Hydrogel Waste polymers Organo clay Heavy metal ions Adsorption mechanism

An Intelligent Harmonic Synthesis Technique for Air-Gap Eccentricity Fault Diagnosis in Induction Motors

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2017年第6期30卷 1296-1304页

作者： De Z.Li Wilson Wang Fathy ismail Department of Mechanical Engineering Lakehead University Department of Mechanical & Mechatronics Engineering University of Waterloo

Induction motors （IMs） are commonly used in various industrial applications. To improve energy con- sumption efficiency, a reliable IM health condition moni- toring system is very useful to detect IM fault at its earliest stage to prevent operation degradation, and malfunction of IMs. An intelligent harmonic synthesis technique is pro- posed in this work to conduct incipient air-gap eccentricity fault detection in IMs. The fault harmonic series are syn- thesized to enhance fault features. Fault related local spectra are processed to derive fault indicators for IM air- gap eccentricity diagnosis. The effectiveness of the pro- posed harmonic synthesis technique is examined experi- mentally by IMs with static air-gap eccentricity and dynamic air-gap eccentricity states under different load conditions. Test results show that the developed harmonic synthesis technique can extract fault features effectively for initial IM air-gap eccentricity fault detection.

关键词： Air-gap eccentricity Current signal Faultdetection Induction motor

Sound preferences of the dense urban environment： Soundscape of Cairo

在线全文

学校读者我要写书评

暂无评论

Frontiers of Architectural Research 2014年第1期3卷 55-68页

作者： Mostafa Refat ismail Department of Architecture Engineering Ain Shams University Cairo 11566 Egypt

A questionnaire study was conducted to investigate the soundscape preferences of the sonic environment in Cairo. Participants, who were Cairo residents, were questioned about their appraisal of fami（iar urban soundscapes in a dose- and open-ended format questionnaire. Psycholinguistic data analysis of verbal descriptions expressed by respondents was conducted to identify the re（evance of semantic categories of environmental sounds and quantitative soundscape aspects for the urban sonic environment of Cairo. Resu（ts confirmed a direct retevance of the linguistic semantic auditory judgment and of the outputs of the quantitative dose-ended questions. Cairenes were also found to express their sonic environment （inguisti- cal（y based on physical properties rather than semantic features and values. Analyzing the relative annoyance increase （RAI） of the dose-ended part, overall positive RAI va（ues for all sound categories reveal how sensitive to noise Cairo residents are. Results further showed that at an RAI value of approximately 27%, sound category perception transforms from positive to negative.

关键词： Acoustics Soundscape Sound preference

Quiet environment： Acoustics of vertical green wall systems of the Islamic urban form

在线全文

学校读者我要写书评

暂无评论

Frontiers of Architectural Research 2013年第2期2卷 162-177页

作者： Mostafa Refat ismail Architecture Engineering Ain Shams Univeristy Cairo 11566 Egypt

The development of sustainability has made the application of green concepts to cityscapes and urban design mandatory and has popularized the installation of vegetation on external street walls. Introducing greenery on external building elements is beneficial to the environment, reducing the heat impact experienced in ＂urban heat islands＂ and enhancing an area＇s visual effect. The popularity of such green systems has necessitated the assessment of their acoustic characteristics and their impact on long-distance noise propagation. These effects become important in hot climates, where the topology of the dense urban texture gives building walls larger areas than exposed streets, thereby amplifying the effects of the former＇s acoustic characteristics on noise levels. Considering the resultant sound level at a particular location between buildings as the contribution of several remote sources, a simplified computer model based on energy exchange is developed in this study. Owing to the complexity of the urban landscape, buildings are assumed to be an array of rectangular blocks. The computer model is used to investigate the effects of the installation of street vertical ve^letation on long-distance noise propagation, as well as those of the geometric parameters of the dense Islamic urban texture on the resultant noise levels.

关键词： Acoustics Green wails Sound propagation Acoustic computersimulation

Preparation and Antibacterial Activity of Superhydrophobic Modified ZnO/PVC Nanocomposite

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2022年第1期19卷 139-154页

作者： Muntadher ismail Rahmah Raad Saadon Sabry Wisam Jafer Aziz Medical Instrumentation Engineering Department Al-Esraa University CollegeBaghdad10001Iraq Physics Department College of ScienceMustansiriyah UniversityBaghdad10001Iraq

We fabricated a superhydrophobic modified ZnO/PVC nanocomposite cluster with antibacterial properties using the chemical precipitation method and selected solvent/non-solvent(THF/ethanol)to *** effects of ethanol content(47%,50%,53%,and 56%)on nanocomposite morphology and Water Contact Angles(WCAs)were *** measurements confirmed the polycrystalline structure of ZnO with a wurtzite hexagonal phase,and EDX results indicated the presence of all element *** analysis of specimens revealed a rough surface structure resembling a cluster of NPs,and that structure was dominant when the ethanol content increased to 56%.The WCA increased on the superhydrophobic nanocomposite as ethanol content increased,and an optimum WCA(160°±2°)was obtained at an ethanol content of 56%.Antibacterial activity was tested on the superhydrophobic and hydrophobic states,and the superhydrophobic specimens showed good inhibition against Klebsiella *** Staphylococcus ***,the hydrophobic specimens demonstrated no antibacterial activity against *** promising results can inform the development of nanocomposites for many environmental applications.

关键词： ZnO PVC Superhydrophobicity Antibacterial WCA